C# - Hex To String

public String HexToString(String hexString)
{
     int value;
     string stringValue = null;
     char charValue;
     string _strOutput = null;
     string hexValues = hexString;
     string _leftPosition = null;
     Int32 _subLength = 0;
     string _tmp = null;
     string[] hexValuesSplit;

     for (Int32 _i = 0; _i < hexValues.Length; _i=(_i+_subLength))
     {
        _leftPosition = hexValues.Substring(_i, 1);

        switch (_leftPosition.ToUpper())
        {
           case "E":
              _subLength = 3;
              break;
           case "F":
              _subLength = 4;
              break;
           case "0":
              _subLength = 4;
              break;
           default:
              _subLength = 2;
              break;
        }

        _tmp += hexValues.Substring(_i, _subLength) + " ";

     }

     hexValuesSplit = _tmp.Trim().Split(' ');

     foreach (String hex in hexValuesSplit)
     {
        // Convert the number expressed in base-16 to an integer.
        value = Convert.ToInt32("0" + hex, 16);
        // Get the character corresponding to the integral value.
        stringValue = Char.ConvertFromUtf32(value);
        charValue = (char)value;
        //Console.WriteLine("hexadecimal value = {0}, int value = {1}, char value = {2} or {3}", hex, value, stringValue, charValue);

        _strOutput += stringValue;
     }

     return _strOutput;

}